I can no longer resist jumping into this non-SI thread as well.

The more accurate name for this 24 hour timekeeping format is astronomical time. Astronomers were the first ones who routinely used it in this "modern epoch". The navies (British, American, others) then adopted it since they navigated by astronomical sights, using tables prepared by astronomers. From there it crept into the other armed services and some civilian applications. Bowditch and Dutton's probably elaborate more than I do here.

So, let's call it astronomical time instead of military time.

Trivia 1: Astronomers measure right ascension in hours and navigators measure sidereal hour angles in degrees, minutes, and seconds. Thus one measures an "angle" in units of time and one measures "time" in units of angle -- in both cases from the first point of Aries but in opposite directions. Angular positions (declinations) from the equatorial equator are measured the same by both groups and with the same direction nomenclature.

Trivia 2: Lewis and Clark mapped their route using astronomical navigation techniques.

Jim
(who still has his sextant and uses it now and then)

Michael Payne wrote:
We also use 24 hour time in Aviation here in the US, all the documentation I get from my company here in the US is in the 24 hour format so there is no screw-up. I also selected it as an option on the United Airlines web site, have to log on, then it displays the time in the format of my choice. Mike Payne

    ----- Original Message -----
    *From:* Jeremiah MacGregor <mailto:[email protected]>
    *To:* U.S. Metric Association <mailto:[email protected]>
    *Sent:* Sunday, 01 February 2009 23:12
    *Subject:* [USMA:42799] Re: Hot and dry

    Stephen,
What does a military dictatorship have to do with military time? In
    the US, we call the 24 h time format as military time.  It is
    because the only time it is used in the US is by the military, at
least as far as the public is aware of. Jerry

    ------------------------------------------------------------------------
    *From:* Stephen Humphreys <[email protected]
    <mailto:[email protected]>>
    *To:* U.S. Metric Association <[email protected]
    <mailto:[email protected]>>
    *Sent:* Sunday, February 1, 2009 1:20:37 PM
    *Subject:* [USMA:42782] Re: Hot and dry

    No.

    However most 'metric countries' also use the 24h time format.  These
    countries tend not to be military dictatorships though.

    ------------------------------------------------------------------------
    Date: Sun, 1 Feb 2009 09:25:25 -0800
    From: [email protected]
    Subject: Re: [USMA:42747] Re: Hot and dry
    To: [email protected]; [email protected]

    Stephen,
What do you mean? Are you saying that when we use metric units we should also use military time too? Jerry

    ------------------------------------------------------------------------
    *From:* Stephen Humphreys <[email protected]>
    *To:* U.S. Metric Association <[email protected]>
    *Sent:* Sunday, February 1, 2009 10:44:20 AM
    *Subject:* [USMA:42747] Re: Hot and dry

    "for about 6 hours from about 7:00 last night"

    I would have thought 19:00h would have been the better time
    measurement for that.

    ------------------------------------------------------------------------
    From: [email protected]
    To: [email protected]
    Subject: [USMA:42669] Re: Hot and dry
    Date: Sat, 31 Jan 2009 16:17:27 +1100

    Dear Jerry,

    You might like to reflect on that for a little longer. Consider this
    statement from 'the Age' newspaper this morning:

    The hottest recorded temperature in Victoria was 45.8 degrees at
    Avalon airport, near Geelong, at 5pm on Thursday. This is
    from 
http://www.theage.com.au/national/as-train-tracks-melted-and-trees-wilted-we-all-went-a-little-bit-troppo-20090130-7u1c.html?page=1
    and there is  further evidence at
http://www.theage.com.au/national/fire-rages-through-6000-hectares-towards-transmission-lines-20090131-7u7f.html
    In Geelong, we lost all electrical supplies, due to a heat-related
    circuit fault, for about 6 hours from about 7:00 last night. No
    radio, no television, and (wait for it) no air conditioning. The
    train tracks buckled and many train services simply ceased,
    thousands of commuters who go from Geelong to Melbourne each day
    were stranded in Melbourne. Many houses were lost in wild fires
    known here as '/bush fires/'

    However, look on the bright side. All of the reports in the media,
    print, radio, and television use metric units only in their
    broadcasts. It is quite rare for anyone to try to dumb the initial
    reports down 'for the public'. It seems that the Australian public
    is now quite used to weather reports in metric units.

    Cheers,

    Pat Naughtin
    Geelong, Australia

    On 2009/01/31, at 3:27 PM, Jeremiah MacGregor wrote:

        Pat,
That right, rub it in! It is bad enough we have freezing cold
        of -10~-20 C, but the unplowed roads and the meter plus
        mountains of snow are enough to drive one to the happy farm.  I
        have 50 cm of snow in my yard with piles to 1.6 m.  Care to trade?
You could be kind and ship some of that heat towards North America. Jerry.

        ------------------------------------------------------------------------
        *From:* Pat Naughtin <[email protected]
        <mailto:[email protected]>>
        *To:* U.S. Metric Association <[email protected]
        <mailto:[email protected]>>
        *Sent:* Monday, January 26, 2009 5:49:43 PM
        *Subject:* [USMA:42609] Hot and dry

        Dear All,

        As you enjoy your nice crisp cool winter days, spare a thought
        for we folk in the southern hemisphere. In the next few days we
        expect the following temperatures:

        Tuesday 38 °C
        Wednesday 41 °C
        Thursday 40 °C
        Friday 40 °C
        Saturday 40 °C
        Sunday 30 °C

        See the
        article 
http://www.theage.com.au/national/melbourne-faces-worst-hot-spell-in-100-years-20090126-7q0c.html
 for
        the details. Melbourne is the nearest big city to Geelong.
        Melbourne is 70 kilometres north-east of Geelong.

        You might recall the rhyme:

        Zero is freezing,
        10 is not,
        20 is pleasing,
        30 is hot,
        40 frying,
        50 dying.

        I don't know who wrote the first three lines but I added the
        last two to consider Australian conditions. We live near the
        coast of the Southern Ocean but 200 kilometres inland from us
        you can expect the predicted temperatures to be about 3 °C
        hotter than here. Swan Hill, for example, will reach 44 °C on
        Wednesday and 43 °C on Thursday, Friday, and Saturday..

        It's amusing to see chatter in northern hemisphere media reports
        about 'global cooling'. You won't get much empathy for that
        position here in Australia as we are about to experience our
        second driest January in 159 years that is being topped off with
        this current heat wave. So far this month Geelong has had 0.4
        millimetres of rain compared to a long term average of 35.6
        millimetres for January.

        Cheers,
Pat Naughtin

        PO Box 305 Belmont 3216,
        Geelong, Australia
        Phone: 61 3 5241 2008

        Metric system consultant, writer, and speaker, Pat Naughtin, has
        helped thousands of people and hundreds of companies upgrade to
        the modern metric system smoothly, quickly, and so economically
        that they now save thousands each year when buying, processing,
        or selling for their businesses. Pat provides services and
        resources for many different trades, crafts, and professions for
        commercial, industrial and government metrication leaders in
        Asia, Europe, and in the USA. Pat's clients include the
        Australian Government, Google, NASA, NIST, and the metric
        associations of Canada, the UK, and the USA.
See http://www.metricationmatters.com <http://www.metricationmatters.com/>for more metrication
        information, contact Pat at [email protected]
        <mailto:[email protected]> or to get the free
        '/Metrication matters/' newsletter go
        to: http://www.metricationmatters.com/newsletter to subscribe.




    Cheers,
Pat Naughtin

    PO Box 305 Belmont 3216,
    Geelong, Australia
    Phone: 61 3 5241 2008

    Metric system consultant, writer, and speaker, Pat Naughtin, has
    helped thousands of people and hundreds of companies upgrade to the
    modern metric system smoothly, quickly, and so economically that
    they now save thousands each year when buying, processing, or
    selling for their businesses. Pat provides services and resources
    for many different trades, crafts, and professions for commercial,
    industrial and government metrication leaders in Asia, Europe, and
    in the USA. Pat's clients include the Australian Government, Google,
    NASA, NIST, and the metric associations of Canada, the UK, and the
USA. See http://www.metricationmatters.com <http://www.metricationmatters..com/>for more metrication
    information, contact Pat at [email protected]
    <mailto:[email protected]> or to get the free
    '/Metrication matters/' newsletter go
    to: http://www.metricationmatters.com/newsletter
    <http://www..metricationmatters.com/newsletter> to subscribe.


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